RNifti: Fast R and C++ Access to NIfTI Images

Provides very fast read and write access to images stored in the
NIfTI-1 and ANALYZE-7.5 formats, with seamless synchronisation between
compiled C and interpreted R code. Also provides a C/C++ API that can be
used by other packages. Not to be confused with 'RNiftyReg', which performs
image registration.